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PM6670AS 数据表(PDF) 43 Page - STMicroelectronics

部件名 PM6670AS
功能描述  Complete DDR2/3 memory power supplies controller
PDF  54 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6670AS 数据表(HTML) 43 Page - STMicroelectronics

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PM6670AS
Application information
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It must be taken into account that in some MLCC the capacitance decreases when the
operating voltage is near the rated voltage. In Table 7 some MLCC suitable for most of
applications are listed.
8.1.3
Output capacitor selection
Using tantalum or electrolytic capacitors, the selection is made referring to ESR and voltage
rating rather than by a specific capacitance value.
The output capacitor has to satisfy the output voltage ripple requirements. At a given
switching frequency, small inductor values are useful to reduce the size of the choke but
increase the inductor current ripple. Thus, to reduce the output voltage ripple a low ESR
capacitor is required.
To reduce jitter noise between different switching regulators in the system, it is preferable to
work with an output voltage ripple greater than 25 mV.
As far as it concerning the load transient requirements, the Equivalent Series Resistance
(ESR) of the output capacitor must satisfy the following relationship:
Equation 36
where VRIPPLE is the maximum tolerable ripple voltage.
In addition, the ESR must be high enough high to meet stability requirements. The output
capacitor zero must be lower than the switching frequency:
Equation 37
Table 7. Evaluated MLCC for input filtering
Manufacturer
Series
Capacitance (µF) Rated voltage (V)
Maximum Irms
@100 kHz (A)
TAIYO YUDEN UMK325BJ106KM-T
10
50
2
TAIYO YUDEN
GMK316F106ZL-T
10
35
2.2
TAIYO YUDEN
GMK325F106ZH-T
10
35
2.2
TAIYO YUDEN
GMK325BJ106KN
10
35
2.5
TDK
C3225X5R1E106M
10
25
MAX
,
L
MAX
,
RIPPLE
I
V
ESR
∆
≤
out
Z
SW
C
ESR
2
1
f
f
⋅
⋅
π
=
>



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